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Sega Superstars Tennis

Courts
Golden Axe - Win all Super Monkey Ball missions
NiGHTS - Win Doubles Match (NiGHTS stage)
OutRun - Win Doubles Match (OutRun stage)
Sonic The Hedgehog - Win Singles Match (Sonic the Hedgehog stage)


Ball Games
Puyo Pop Fever - Beat Get A High Score! (Puyo Puyo Fever stage)
Space Harrier - Beat Get A High Score! (Space Harrier stage)
Virtua Squad - Beat Get A High Score! (Virtua Squad stage)


Stages
Alex Kidd - Win Get A High Score! (Space Harrier stage)
Golden Axe - Win Speed Rings (Sonic the Hedgehog stage)
NiGHTS - Win Monkey Ball Keep Up (Super Monkey Ball stage)
OutRun - Win Hit Justice Shots (Virtua Squad stage)
Puyo Pop Fever - Win Doubles Match (Super Monkey Ball stage)
Space Harrier - Win Tournament Singles (Space Channel 5 or Virtua Squad)
Virtua Squad - Win Hit the Big Zombies! (Curien Mansion stage)

Characters
Upon completion of all events per stage, you will unlock a corresponding player. They are:

Alex Kidd - Alex Kidd stage
Amy Rose - Sonic the Hedgehog stage
Gilius Thunderhead - Golden Axe stage
Gum - Jet Grind Radio stage
MeeMee - Super Monkey Ball stage
Pudding - Space Channel 5 stage
Reala - NiGHTS stage
Shadow the Hedgehog - Sonic the Hedgehog stage